Weather Summary for September 2006

Updated: October 2nd, 2006
Hurricane Florence ...

Tables | Graphs

Hurricane Florence made landfall on the 11th as a Category 1 Hurricane.  A maximum sustained wind speed (10 minute mean) of 71 knots with a gust to 97 knots was recorded at one of our remote observing sites in St. David’s, however, only 59 (2 minute mean) knots was recorded at the airport.   Despite the hurricane, the remainder of the month was mostly sunny with below normal number of days with measurable precipitation, slightly cooler air temperatures, and slightly above normal sea temperatures.  Hurricanes Gordon, Helene and Isaac all passed well to the east.

Fine weather began the month of September, lasting into the 2nd.  A very slow moving cold front brought thunderstorms, moderate to strong southeasterly winds, and showers through out the day on the 3rd.  Showers associated with the front continued to fall on the 4th, with moderate southeasterly winds.  A few early showers fell on the 5th, however skies cleared to mostly sunny, with light southwesterly winds. High pressure dominated on the 6th, with mostly sunny skies and light southerly winds backing east-southeasterly on the 7th. 

Tropical Storm Florence, located well east of the Windward Islands began to be monitored closely.  Conditions remained pleasant on the 8th, however by late afternoon a Hurricane Watch was issued for Bermuda, as Florence was expected to become a Hurricane and pass very close to Bermuda.  The first signs of rain associated with Tropical Storm Florence came in the afternoon on the 9th.  A Tropical Storm Warning was issued.  Winds began to increase on the 10th as Hurricane Florence continued her approach, with a Hurricane Warning being issued at 5:30 am.  Thunderstorms and showers arrived late morning, as winds increase to strong from the east, gusting tropical storm force.  Suspected tornados damaged properties in the Western Parishes.  Florence arrived on the 11th producing category one hurricane strength winds beginning in the early morning, with showers and blowing spray.  Winds finally began to ease to tropical storm force, with some clearing in the late afternoon.  The Hurricane Warning was replaced by a Tropical Storm Warning, finally decreasing to a Small Craft Warning by the 12th, as skies cleared and westerly to northwesterly winds became moderate to strong. 

A few brief showers fell on the 13th, while skies were a mix of sun and cloud and winds were light from the east-northeast.  Fair weather settled in on the 14th, while light to moderate easterly winds veered to the southwest by the 17th.  Light to moderate winds backed south-southwest on the 18th, while skies remained mostly sunny, lasting into the 20th.  A cold front from the west and Hurricane Helene to the east caused mostly cloudy skies and isolated shower on the 21st, as winds veered to the north.  Despite passing at a distance greater than 400nm, Helene caused dangerous surf for Bermuda.  High pressure returned on the 22nd with mostly sunny skies, while northerly winds remained moderate to strong.  Cooler, drier, and sunny conditions lasted into the 24th.  

Skies were mostly cloudy with isolated showers during the day, and mist in the evening on the 25th.  Clouds cleared to mostly sunny skies by sunrise on the 26th, as high pressure dominated with light westerly winds.  Winds backed southerly on the 27th, while skies remained mostly sunny.  A brief overnight shower gave way to mostly clear skies throughout the 28th, with light southwesterly winds.  An approaching cold front caused a few showers on the 29th, while the majority of the day was mostly sunny with light southerly winds.  Mostly sunny skies closed the month as light southeasterly winds backed east-northeast on the 30th.

Produced by the Bermuda Weather Service.
Unless otherwise stated, all statistical data are based on observations taken at Bermuda International Airport.

Tables
 

TEMPERATURE
  FAHRENHEIT CELSIUS DATE
Mean Maximum 84.0 (-0.7) 28.9  
Mean Minimum 75.2 (-0.5) 24.0  
Mean Monthly 78.9 (-1.5) 26.1  
Absolute Maximum 87.4 30.8 1st
Absolute Minimum 72.7 22.6 4,22,23

RELATIVE HUMIDITY
  PERCENT DATE
Mean Daily Maximum 90 
Mean Daily Minimum 70  
Mean Monthly 81  
Absolute Maximum 98 3,4,11,15,16
Absolute Minimum 52 23rd

PRECIPITATION (Inches)
DAY AMOUNT DAY AMOUNT
1st 0.00 17th 0.00
2nd 1.14 18th 0.00
3rd 0.75 19th 0.00
4th 1.57 20th 0.00
5th 0.00 21st 0.26
6th 0.00 22nd 0.00
7th 0.00 23rd 0.00
8th 0.00 24th 0.00
9th 0.10 25th 0.07
10th 0.51 26th 0.00
11th 0.71 27th 0.00
12th 0.00 28th 0.00
13th 0.00 29th 0.00
14th 0.00 30th 0.00
15th 0.00  
16th 0.00    
TOTAL: 5.11(+0.06)
    DAYS: 8 (-7)

SEA TEMPERATURE
  FAHRENHEIT CELSIUS DATE
Maximum 84.4 29.1 1st
Minimum 79.7 26.5 26th
Mean 82.1 (+0.8) 27.8  

BAROMETRIC PRESSURE
  INCHES hPa DATE
Maximum(Daily Mean) 30.18 1023.1 23rd
Minimum(Daily Mean) 29.46 998.6 11th
Mean(Monthly) 30.04 1018.3  

PEAK WIND
    DATE
Maximum Gust (Kts) 78 11th
Direction(Deg True) 230

MAXIMUM MEAN WIND (2 min.)
    DATE
Maximum Mean (Kts) 59 11th
Direction(Deg True) 210

MONTHLY MEAN WIND (2 min.)
Speed (Kts) 9.8

DAYS WITH THUNDER
2
10

SUNSHINE DURATION (Hours)
    DATE
Maximum 11.6 6
Minimum 0.0 3, 11
Mean 7.4  
Total 223.2  

 
1 Departures from 1971-2000 normals are shown in parentheses where available (Max/Min temperature/rainfall/raindays).

 
2 Trace amounts(<0.01 inches) are not included in precipitation data.

Graphs

[Daily Temperatures]

[Daily Rainfall]

[Daily Sunshine Hours]

Data Source: The Bermuda Weather Service